While the tech these companies built (stateful reconstruction) is quite hard to engineer, large-scale observability platforms like Datadog were much more succes

While the tech these companies built (stateful reconstruction) is quite hard to engineer, large-scale observability platforms like Datadog were much more successful as they could cover a much larger surface area with minimal incremental effort. Even APM companies like New Relic and AppD struggled to justify the value they were delivering with their well-engineered code-level agents in the face of large-scale server/process metrics collection done by the Datadog agent. In addition, these techniques have been prone to event misses (partial reconstruction) in case the ring buffer overflows and are ineffective in the face of SSL traffic.